let createError = require('http-errors');
let express = require('express');
let path = require('path');
let cookieParser = require('cookie-parser');
let logger = require('morgan');
let session = require('express-session');
global.database = require('./utils/node-connect-mongodb');

let indexRouter = require('./routes/index');
let usersRouter = require('./routes/users');

let app = express();
//设置允许跨域
app.all("*", function (req, res, next) {
    let originList = [
        "http://localhost:8080",
    ];
    if (originList.includes(req.headers.origin)) {
        //设置允许跨域的域名，*代表允许任意域名跨域
        res.header("Access-Control-Allow-Origin", req.headers.origin);
    }
    //允许的header类型
    res.header("Access-Control-Allow-Headers", "content-type");
    //跨域允许的请求方式
    res.header("Access-Control-Allow-Methods", "DELETE,PUT,POST,GET,OPTIONS");
    if (req.method.toLowerCase() === 'options') {
        res.send(200);  //让options尝试请求快速结束
    } else {
        next();
    }
});

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

//配置session验证机制
app.use(session({
    name: "sessionId",
    secret: '$#$#$#$bidding$#$#$#$',
    resave: false,
    saveUninitialized: false,
    cookie: {
        maxAge: 1000 * 60 * 60
    }
}));
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({extended: false}));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/users', usersRouter);

// catch 404 and forward to error handler
app.use(function (req, res, next) {
    next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
    // set locals, only providing error in development
    res.locals.message = err.message;
    res.locals.error = req.app.get('env') === 'development' ? err : {};

    // render the error page
    res.status(err.status || 500);
    res.render('error');
});

module.exports = app;
